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Fun with pg_catalog.pg_depend
Learning PostgreSQL and SQL in general probably begins with the concept of TABLES. Then probably VIEWS, INDEXES and maybe TRIGGERS. Some users might not ever go any further, which is sad, because there...
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SET search_path for all SECURITY DEFINER functions
As pointed out by Peter Eisentraut in a blog post named Schema Search Paths Considered Pain in the Butt, you need to make sure the search_path is explicitly set for all SECURITY DEFINER functions in...
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Garbage Collection of Unused PostgreSQL Tables and Columns
Over the last five years, our database at Trustly have kept growing in number of tables, columns and functions, where some of the tables and columns aren’t being used by any database functions any...
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psql \watch 1400000000 epoch time countdown counter
SET TIMEZONE TO 'UTC'; \t \a \pset fieldsep ' ' SELECT (('epoch'::timestamptz + 14*10^8 * '1 s'::interval)-now())::interval(0), (14*10^8-extract(epoch from now()))::int, extract(epoch from now())::int...
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“How we use PostgreSQL at Trustly” at PGConf.EU
Slides from my talk, How we use PostgreSQL at Trustly, are now available.
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Finding missing foreign keys
By coincidence I stumbled upon a table where one of its columns didn’t have a foreign key. I found this strange, since our convention is to always add foreign keys when appropriate. But humans are...
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Pgcronjob: Cron daemon to run user defined functions
I find myself quite often having to split a large write operation such as updating millions of rows in a heavily used table. This usually boils down to writing a small Perl script that runs a small...
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PgTerminator: Kill misbehaving db users if important processes are waiting
If you are a DBA and ever have had to manually call pg_terminate_backend() to kill some misbehaving backend process, then this tool might be of interest. Long running queries are not a problem, as long...
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pg_catalog visualized
I couldn’t find any graph showing all the relations between all the pg_catalog tables, so just for fun I wrote a little script to parse the SGML and generate a graph using GraphViz. #!/usr/bin/perl use...
View ArticleUsing pg_badplan to CREATE STATISTICS is a good plan
Thanks to Thomas Vondra’s presentation CREATE STATISTICS – What is it for? at Nordic PGDay 2018, my Trustly colleague Claes Jakobsson came up with the idea for a new extension. The presentation...
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